Google recently bid $900 million fro the patent portfolio of Nortel Networks. It has been reported the bid is an effort to defend itself against patent litigation.
Nortel is said to be in bankruptcy and this is an auction of its assets. The bid by Google may grow larger because of this too. If Google is successful in its bid to acquire Nortel, the purchase would be the third-largest purchase by Google. Small only to its payments for YouTube and DoubleClick.
For more on this, visit The New York Times